I've got a script that generates fairly complicated reports using SVGs as templates. The "master" template is an SVG that contains pointers to additional SVGs that provide the content for the report. These SVGs are generated programatically. The point of the master is to layout the content SVGs on the page. To make editing easy, I use a master template that contains colored boxes instead of links to images. Currently I convert the master template manually. I would like to automate this. How can I replace each line in the template:

<rect x="36" y="36" fill="#0000FF" width="392.4" height="43.2"/>

with:

<image overflow="visible" width="392.4" height="43.2" xlink:href="0000FF.svg" transform="matrix(1 0 0 1 36 36)"></image> ? Additionally, for one particular box, specified by a certain fill color, I would like to read the height so that I can use this to adjust how part of the image generation script functions.

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